Connectivity issue with nRF9160 in some locations

RE: Connectivity issue with nRF9160 in some locations

dejans — Thu, 27 Nov 2025 07:28:26 GMT

Hi,

Thank you for the update.

Best regards,
Dejan

RE: Connectivity issue with nRF9160 in some locations

purush123 — Wed, 26 Nov 2025 13:21:13 GMT

I'm sorry for the delayed response , We found that this is not modem issue, its sim vendor issue. we have changed the SIM vendor and we don't see the connectivity issues, But the information that you provided is very useful to check the signal strength and other modem debug info.

RE: Connectivity issue with nRF9160 in some locations

dejans — Wed, 10 Sep 2025 09:30:38 GMT

Hi Purush,

[quote user="purush123"]In the meantime, I am also testing with the nRF9160 DK to check if the same issue occurs. Could you please guide me on which sample application is best suited to reproduce and root cause this?[/quote]

It is still not quite clear what the root cause is in your case. You can start with your own application to see if you can reproduce the problem using nRF9160-dk. Having modem trace could be useful.

[quote user="purush123"]I am also trying to use the Cellular Monitor application, but it seems to hang indefinitely. Is there a recommended or compatible application that I should load on the DK for Cellular Monitor to work? I assume the application should enable CONFIG_NRF_MODEM_LIB_TRACE=y, but I’m not sure which sample does this out of the box.[/quote]

It is unexpected that Cellular Monitor just hangs. Can you provide some details about this? You should be able to open Cellular Monitor and connect to your board regardless of the firmware that is running on your board.
Regarding modem trace, here are some links for your reference
- Cellular Monitor overview
- Cellular Monitor requirements
- nRF modem tracing using snippets
- capturing modem trace

Here is information from Cellular Monitor itself

and here is what is available from Cellular Monitor's Advanced Options

Best regards,
Dejan

RE: Connectivity issue with nRF9160 in some locations

purush123 — Tue, 09 Sep 2025 12:48:32 GMT

Hi Dejan,

Thank you for the suggestion. I will try to capture the information using AT+CEREG=5 and AT+CNEC=16 in the location where I am seeing the problem.

In the meantime, I am also testing with the nRF9160 DK to check if the same issue occurs. Could you please guide me on which sample application is best suited to reproduce and root cause this?

I am also trying to use the Cellular Monitor application, but it seems to hang indefinitely. Is there a recommended or compatible application that I should load on the DK for Cellular Monitor to work? I assume the application should enable CONFIG_NRF_MODEM_LIB_TRACE=y, but I’m not sure which sample does this out of the box.

If Cellular Monitor is not suitable, could you suggest any other way to capture modem traces?

Thanks

Purush

RE: Connectivity issue with nRF9160 in some locations

dejans — Tue, 09 Sep 2025 11:51:18 GMT

Hi,

Can you try to use AT+CEREG=5 to get more detailed information about potential reject cause?

Can you also try to use +CNEC command (AT+CNEC=16) to enable CNEC_ESM error codes?

Best regards,
Dejan